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in this age of technology that they're able to get so much incoming information from so many different sources. on the other hand, as you say, you then have to make sure that you are whittling that down to the right sources of information. >> that's right. in this case on the video front and the photographic front, they've got a huge advantage. they know where the explosions were. you can actually work out from there. krou don't know where the videos and photos came from the public. but in terms of buildings, once you have a picture of anyone suspicious, you move out and you, you know, rapidly moving circles. how long would it take if someone was walking? let's look at that video camera. you try to piece this together. that's what what was done by the british officials after the bombing on 7/7 in 2005 and they were fundamentally able to track them all the way back to their homes. >> kevin, we just learned today the name of the third tragic fatality in this bombing. ling si lu, a graduate student from china studying statistics at boston university. i don't need to tell you the emotions around t
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